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‎.gitignore‎

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*.class
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build/**
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dist/**
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.idea/**
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*

‎LICENSE‎

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MIT License
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Copyright (c) 2015 Ian Preston
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.

‎README.md‎

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# java-multiaddr
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Java implementation of multiaddr
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## Usage
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MultiAddress m = new MultiAddress("/ip4/127.0.0.1/tcp/1234");
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or
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MultiAddress m = new MultiAddress("/ipfs/QmcgpsyWgH8Y8ajJz1Cu72KnS5uo2Aa2LpzU7kinSupNKC");
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## Compilation
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To compile just run ant.

‎build.xml‎

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<project name="java-multiaddr" default="dist" basedir=".">
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<description>
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Java Multiaddr
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</description>
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<property name="src" location="src"/>
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<property name="build" location="build"/>
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<property name="dist" location="dist"/>
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<path id="dep.runtime">
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<fileset dir="./lib">
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<include name="**/*.jar" />
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</fileset>
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</path>
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<target name="init">
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<mkdir dir="${build}"/>
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</target>
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<target name="compile" depends="init" description="compile the source">
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<javac includeantruntime="false" srcdir="${src}" destdir="${build}" debug="true" debuglevel="lines,vars,source">
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<classpath>
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<fileset dir="lib">
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<include name="**/*.jar" />
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</fileset>
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</classpath>
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</javac>
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</target>
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<target name="dist" depends="compile" description="generate the distribution">
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<mkdir dir="${dist}/lib"/>
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<copy todir="${dist}/lib">
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<fileset dir="lib"/>
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</copy>
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<manifestclasspath property="manifest_cp" jarfile="myjar.jar">
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<classpath refid="dep.runtime" />
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</manifestclasspath>
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<jar jarfile="${dist}/Multiaddr.jar" basedir="${build}">
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<manifest>
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<attribute name="Class-Path" value="${manifest_cp}"/>
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</manifest>
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</jar>
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<copy todir=".">
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<fileset file="${dist}/Multiaddr.jar"/>
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</copy>
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</target>
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<target name="test" depends="compile,dist">
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<junit printsummary="yes" fork="true" haltonfailure="yes">
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<jvmarg value="-Xmx1g"/>
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<classpath>
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<pathelement location="lib/junit-4.11.jar" />
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<pathelement location="lib/hamcrest-core-1.3.jar" />
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<pathelement location="Multiaddr.jar" />
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</classpath>
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<test name="org.ipfs.api.MultiaddrTests" haltonfailure="yes">
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<formatter type="plain"/>
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<formatter type="xml"/>
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</test>
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</junit>
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</target>
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<target name="clean" description="clean up">
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<delete dir="${build}"/>
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<delete dir="${dist}"/>
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</target>
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</project>

‎lib/Multihash.jar‎

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‎lib/hamcrest-core-1.3.jar‎

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‎lib/junit-4.12.jar‎

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‎src/main/java/org/ipfs/api/Base32.java‎

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package org.ipfs.api;
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import java.math.*;
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/**
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* Based on RFC 4648
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*/
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public class Base32 {
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private static final String ALPHABET = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
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private static final BigInteger BASE = BigInteger.valueOf(32);
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public static String encode(byte[] input) {
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// TODO: This could be a lot more efficient.
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BigInteger bi = new BigInteger(1, input);
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StringBuffer s = new StringBuffer();
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while (bi.compareTo(BASE) >= 0) {
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BigInteger mod = bi.mod(BASE);
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s.insert(0, ALPHABET.charAt(mod.intValue()));
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bi = bi.subtract(mod).divide(BASE);
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}
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s.insert(0, ALPHABET.charAt(bi.intValue()));
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// Convert leading zeros too.
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for (byte anInput : input) {
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if (anInput == 0)
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s.insert(0, ALPHABET.charAt(0));
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else
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break;
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}
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return s.toString();
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}
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public static byte[] decode(String input) {
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byte[] bytes = decodeToBigInteger(input).toByteArray();
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// We may have got one more byte than we wanted, if the high bit of the next-to-last byte was not zero. This
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// is because BigIntegers are represented with twos-compliment notation, thus if the high bit of the last
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// byte happens to be 1 another 8 zero bits will be added to ensure the number parses as positive. Detect
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// that case here and chop it off.
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boolean stripSignByte = bytes.length > 1 && bytes[0] == 0 && bytes[1] < 0;
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// Count the leading zeros, if any.
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int leadingZeros = 0;
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for (int i = 0; input.charAt(i) == ALPHABET.charAt(0); i++) {
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leadingZeros++;
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}
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// Now cut/pad correctly. Java 6 has a convenience for this, but Android can't use it.
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byte[] tmp = new byte[bytes.length - (stripSignByte ? 1 : 0) + leadingZeros];
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System.arraycopy(bytes, stripSignByte ? 1 : 0, tmp, leadingZeros, tmp.length - leadingZeros);
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return tmp;
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}
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public static BigInteger decodeToBigInteger(String input) {
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BigInteger bi = BigInteger.valueOf(0);
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// Work backwards through the string.
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for (int i = input.length() - 1; i >= 0; i--) {
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int alphaIndex = ALPHABET.indexOf(input.charAt(i));
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if (alphaIndex == -1) {
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throw new IllegalStateException("Illegal character " + input.charAt(i) + " at " + i);
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}
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bi = bi.add(BigInteger.valueOf(alphaIndex).multiply(BASE.pow(input.length() - 1 - i)));
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}
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return bi;
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}
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}

‎src/main/java/org/ipfs/api/MultiAddress.java‎

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package org.ipfs.api;
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import java.io.*;
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import java.util.*;
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public class MultiAddress
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{
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private final byte[] raw;
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public MultiAddress(String address) {
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this(decodeFromString(address));
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}
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public MultiAddress(byte[] raw) {
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encodeToString(raw); // check validity
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this.raw = raw;
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}
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public byte[] getBytes() {
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return Arrays.copyOfRange(raw, 0, raw.length);
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}
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public boolean isTCPIP() {
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String[] parts = toString().substring(1).split("/");
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if (parts.length != 4)
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return false;
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if (!parts[0].startsWith("ip"))
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return false;
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if (!parts[2].equals("tcp"))
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return false;
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return true;
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}
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public String getHost() {
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String[] parts = toString().substring(1).split("/");
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if (parts[0].startsWith("ip"))
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return parts[1];
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throw new IllegalStateException("This multiaddress doesn't have a host: "+toString());
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}
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public int getTCPPort() {
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String[] parts = toString().substring(1).split("/");
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if (parts[2].startsWith("tcp"))
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return Integer.parseInt(parts[3]);
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throw new IllegalStateException("This multiaddress doesn't have a tcp port: "+toString());
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}
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private static byte[] decodeFromString(String addr) {
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while (addr.endsWith("/"))
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addr = addr.substring(0, addr.length()-1);
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String[] parts = addr.split("/");
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if (parts[0].length() != 0)
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throw new IllegalStateException("MultiAddress must start with a /");
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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try {
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for (int i = 1; i < parts.length;) {
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String part = parts[i++];
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Protocol p = Protocol.get(part);
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p.appendCode(bout);
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if (p.size() == 0)
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continue;
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String component = parts[i++];
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if (component.length() == 0)
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throw new IllegalStateException("Protocol requires address, but non provided!");
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bout.write(p.addressToBytes(component));
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}
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return bout.toByteArray();
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} catch (IOException e) {
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throw new IllegalStateException("Error decoding multiaddress: "+addr);
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}
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}
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private static String encodeToString(byte[] raw) {
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StringBuilder b = new StringBuilder();
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InputStream in = new ByteArrayInputStream(raw);
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try {
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while (true) {
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int code = (int)Protocol.readVarint(in);
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Protocol p = Protocol.get(code);
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b.append("/" + p.name());
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if (p.size() == 0)
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continue;
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String addr = p.readAddress(in);
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if (addr.length() > 0)
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b.append("/" +addr);
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}
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}
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catch (EOFException eof) {}
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catch (IOException e) {
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throw new RuntimeException(e);
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}
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return b.toString();
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}
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@Override
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public String toString() {
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return encodeToString(raw);
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}
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@Override
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public boolean equals(Object other) {
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if (!(other instanceof MultiAddress))
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return false;
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return Arrays.equals(raw, ((MultiAddress) other).raw);
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}
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@Override
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public int hashCode() {
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return Arrays.hashCode(raw);
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}
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}

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